Question

Need to get some help please

Answer 1

`S=P(1+rt)`

start by dividing by p on both sides

`\begin{gathered} (S)/(P)=(P)/(P)(1+rt) \\ (S)/(P)=1+rt \end{gathered}`

substract 1 on both sides

`\begin{gathered} (S)/(P)-1=1+rt-1 \\ (S)/(P)-1=rt \end{gathered}`

Divide by t on both sides to solve for r

`\begin{gathered} ((S)/(P)-1)((1)/(t))=(rt)/(t) \\ (S)/(Pt)-(1)/(t)=r \end{gathered}`

ANSWER

`r=(S)/(Pt)-(1)/(t)`